CN109855708B - Flow checking and calibrating device and method - Google Patents
Flow checking and calibrating device and method Download PDFInfo
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Abstract
The invention discloses a flow checking and calibrating device and a flow checking and calibrating method, and relates to the field of measuring instruments. The mass flowmeter calibration device is used for solving the problems of time and labor waste and the like in the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator in the prior art. The device comprises: the system comprises a multi-gas dynamic calibrator, a mass flowmeter, an intelligent gas circuit conversion device and a plurality of standard flowmeters with different measuring ranges; the intelligent gas circuit conversion device comprises a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of branch pipes and a plurality of standard flowmeter input gas circuit electromagnetic valves; the output end of the multi-gas dynamic calibrator is connected with the input end of at least one mass flowmeter; the output end of the mass flowmeter is connected with the multiple branch pipes through the output gas circuit electromagnetic valve of the multiple gas dynamic calibrator; the multi-branch pipe is connected with the standard flow meters with different measuring ranges through a plurality of standard flow meter input gas circuit electromagnetic valves.
Description
Technical Field
The invention relates to the field of measuring instruments, in particular to a flow checking and calibrating device and a flow checking and calibrating method.
Background
According to the environmental air quality standard (GB 3095-2012), the conventional indicators of an automatic environmental air monitoring station (hereinafter referred to as an "air station") include gaseous pollutants (SO) 2 、NO 2 、O 3 And CO), particulate matter (PM 10 And PM 2.5 ) Which takes responsibility for the public to release the quality of the ambient air in real time, is provided with SO 2 、NO 2 、O 3 And a gaseous analyzer such as CO, fig. 1 is a schematic diagram of a working gas path of the gaseous analyzer provided in the prior art, and a working gas path of an air station is shown in fig. 1. SO (SO) 2 The working principle of the gas analyzer is based on the principle of a pulse ultraviolet fluorescence method, and ultraviolet light with the wavelength of 190-230nm is used for irradiating a sample SO 2 Absorbs ultraviolet light to generate energy level transition, SO 2 Transition from ground to excited state, excited state SO 2 Unstable and returns to the ground state and emits fluorescence with a central wavelength of 330nm, and the generated fluorescence intensity and SO 2 The concentration is in direct proportion, and the SO can be obtained by measuring the fluorescence intensity by a photomultiplier and an electronic measurement system 2 Is a concentration of (3). NO (NO) 2 The working principle of the gas analyzer is based on the principle of chemiluminescence method, NO and O 3 Chemical reaction takes place and produces a characteristic luminescence whose intensity is linearly proportional to the concentration of NO, O in the reaction chamber 3 Reacts with NO in the sample to produce excited NO 2 The molecule, photomultiplier tube detects luminescence generated in this reaction to measure the concentration of NO gas. The working principle of the CO gas analyzer is designed by utilizing the characteristic that CO has characteristic absorption to infrared radiation with the wavelength of 4.6 um. Sample gas enters the analyzer and passes through the sampling port. The sample gas then flows through the optical bench. The infrared rays from the infrared light source sequentially pass through the CO and the N in the rotary filter wheel 2 A gas filter. The infrared radiation then enters the reaction chamber (optical bench) through a bandpass (narrowband) interference filter and is absorbed by the sample gas, and the infrared radiation exiting the reaction chamber enters the infrared detector. The reference infrared radiation transmitted by the CO gas filter side cannot be further absorbed by CO in the reaction chamber. The infrared radiation transmitted by the N2 filter side can be strongly absorbed by CO in the reaction chamber. The CO concentration can be obtained by detecting the infrared absorption amplitude related to the CO concentration in the reaction chamber and the infrared detection signal modulated alternately between the two gas filters, demodulating and amplifying the infrared absorption signal, and then sending the signal to a computer for processing. O (O) 3 Working source of analyzerReason is O 3 Molecular absorption of 254nm ultraviolet light, ultraviolet light intensity and O 3 Has a direct relationship with the concentration of (c). In the field of air automatic monitoring, quality Control (Quality Control) work is not only one of key works of air Quality on-line monitoring, but also a powerful means for guaranteeing data accuracy. The accuracy of the monitored data is closely related to quality control means (e.g., span inspection, accuracy inspection, multipoint linearity inspection, etc.). And whether the quality control means such as span inspection, precision inspection and the like are accurate or not depends on whether the distribution flow of the multi-gas dynamic calibrator is accurate or not. In short, whether the distribution flow (built-in mass flowmeter) of the multi-gas dynamic calibrator is accurate or not directly determines whether the monitoring data is accurate or not.
As automatic monitoring equipment, in the operation process, the mass flowmeter of the multi-gas dynamic calibrator can be affected by factors such as vibration, electromagnetic interference, temperature change, pressure change, pipeline leakage, standard gas characteristics and the like, and if the calibration is not timely checked and calibrated, the proportion of the calibration gas can be deviated, so that the monitoring data is distorted.
Periodic inspection of mass flow meters of multi-gas dynamic calibrators is a precondition for stable, reliable operation of air stations. According to the environmental air gaseous pollutant (SO) 2 、NO 2 、O 3 CO) continuous automatic monitoring system technical requirements and detection method (HJ 654-2013), and the linear error of the mass flowmeter of the multi-gas dynamic calibrator is within +/-1%. To achieve this goal, the technician needs to periodically check or calibrate the mass flow meter of the multi-gas dynamic calibrator with a standard flow meter every quarter. According to an instrument standard operation manual, before checking or calibrating a mass flowmeter of a multi-gas dynamic calibrator, a technician needs to use a zero gas generator as a gas source, connects the standard flowmeter with an output port of the multi-gas dynamic calibrator, then manually operates the multi-gas dynamic calibrator, outputs a certain flow of gas according to check points of 20%, 40%, 60%, 80% and the like of a full range, passes through the standard flowmeter, records output values of the mass flowmeter in different ranges and actual measurement flow of the standard flowmeter connected with the mass flowmeter, and calculates according to a least square methodAnd obtaining a calibration curve of the mass flow and the measured flow.
However, because the flow check points are more, for check points with different flow sizes, a proper standard flowmeter is also needed to be manually selected, and the gas paths between the mass flowmeter and the standard flowmeter of the multi-gas dynamic calibrator are manually connected, as shown in fig. 1. As shown in fig. 1, each multi-gas dynamic calibrator is respectively provided with 2 mass flowmeters with 100 times of measuring range difference, and the mass flowmeters are respectively used for controlling the flow of standard gas and zero gas. When the flow calibration operation is carried out, each multi-gas dynamic calibrator needs to be matched with 2 standard flowmeters with different measuring ranges. When the flow is checked, the C1-C8 connection standard flowmeter is required to be measured and checked, and when the deviation of the C1-C8 mass flowmeter is found, the flow is calibrated in an instrument operation panel manually. In addition, the standard flowmeter is easy to be influenced by surrounding environment and people in the measuring process, such as vibration, temperature and pressure change and the like, and the standard flowmeter needs to wait for stable reading when reading the flow value, and particularly consumes time and wastes manpower and material resources when checking the point with lower flow. Therefore, the device and the method for realizing automatic flow checking and calibration of the multi-gas dynamic calibrator are developed, so that the execution difficulty of flow calibration work can be reduced, the measurement error can be reduced, and manpower and material resources can be greatly saved.
In summary, in the prior art, the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator have the problems of time consumption, labor consumption and the like.
Disclosure of Invention
The embodiment of the invention provides a flow checking and calibrating device and a flow checking and calibrating method, which are used for solving the problems of time and labor waste and the like in the checking and calibrating of a mass flowmeter of a multi-gas dynamic calibrator in the prior art.
The embodiment of the invention provides a flow checking and calibrating device, which comprises:
the system comprises a multi-gas dynamic calibrator, a mass flowmeter, an intelligent gas circuit conversion device and a plurality of standard flowmeters with different measuring ranges;
the intelligent gas circuit conversion device comprises a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of branch pipes and a plurality of standard flowmeter input gas circuit electromagnetic valves;
the output end of the multi-gas dynamic calibrator is connected with the input end of at least one mass flowmeter;
the output end of the mass flowmeter is connected with the multiple branch pipes through the output gas circuit electromagnetic valve of the multiple gas dynamic calibrator;
the multi-branch pipe is connected with the standard flow meters with different measuring ranges through a plurality of standard flow meter input gas circuit electromagnetic valves.
Preferably, the system also comprises a zero gas source;
and the output end of the zero gas source is connected with the input end of the multi-gas dynamic calibrator.
Preferably, the system also comprises an industrial personal computer;
and the output ends of the standard flow meters are connected with the input end of the industrial personal computer.
Preferably, the intelligent gas circuit conversion device further comprises a cooling fan, a display screen and a power supply;
the multiple multi-gas dynamic calibrator output gas circuit electromagnetic valves and the multiple standard flowmeter input gas circuit electromagnetic valves are respectively and electrically connected with the power supply;
the display screen is arranged on the outer side of the intelligent gas circuit conversion device and is respectively and electrically connected with a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves and a plurality of standard flowmeter input gas circuit electromagnetic valves;
the cooling fan is arranged on the inner side of the intelligent air path conversion device and is electrically connected with the power supply.
Preferably, the standard flowmeter is a piston flowmeter.
The embodiment of the invention also provides a flow checking and calibrating method, which comprises the following steps:
sequentially opening a multi-gas dynamic calibrator connected with the mass flowmeter to be checked and calibrated, wherein the multi-gas dynamic calibrator outputs a gas circuit electromagnetic valve and a standard flowmeter inputs the gas circuit electromagnetic valve;
selecting a standard flowmeter matched with the flow check point from a plurality of specific standard flowmeters with different measuring ranges according to the size of the flow check point, and connecting the input end of the standard flowmeter with an input gas circuit electromagnetic valve of the standard flowmeter;
when the multi-gas dynamic calibrator generates a first check point flow to be checked, sequentially reading a first flow and a second flow generated by the mass flowmeter and the standard flowmeter;
and if the deviation value determined by the first flow rate and the second flow rate exceeds a set range, calibrating the first flow rate of the output of the multi-gas dynamic calibrator.
Preferably, the method further comprises: and if the deviation value determined by the first flow rate and the second flow rate is within a set range, confirming that the mass flowmeter to be checked is within a set error.
Preferably, after the standard flow meter matched with the flow check point is selected from the standard flow meters with a specific plurality of different ranges according to the size of the flow check point, the method further comprises:
the time for the piston to reciprocate once in the cylinder is determined by the following formula:
Tr＝2X/Y
outputting flow data through the time of one reciprocation of the piston in the cylinder and the constant C time after one reciprocation of the piston in the cylinder, and determining the time of the second flow generated by the standard flow meter through the following formula:
Tc＝Tr+C
wherein X is the cylinder capacity, Y is the size of a flow check point, the time of the reciprocating motion of the Tr piston in the cylinder is one time, C is a constant, and the time of the Tc standard flowmeter for generating the second flow is equal to the time of the Tc standard flowmeter.
Preferably, the deviation value is determined by the following formula:
ΔL＝(La-Ls)/Ls×100％
wherein La is the first flow, ls is the second flow, and DeltaL is the deviation value.
The embodiment of the invention provides a flow checking and calibrating device and a flow checking and calibrating method, wherein the device comprises the following steps: the system comprises a multi-gas dynamic calibrator, a mass flowmeter, an intelligent gas circuit conversion device and a plurality of standard flowmeters with different measuring ranges; the intelligent gas circuit conversion device comprises a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of branch pipes and a plurality of standard flowmeter input gas circuit electromagnetic valves; the output end of the multi-gas dynamic calibrator is connected with the input end of at least one mass flowmeter; the output end of the mass flowmeter is connected with the multiple branch pipes through the output gas circuit electromagnetic valve of the multiple gas dynamic calibrator; the multi-branch pipe is connected with the standard flow meters with different measuring ranges through a plurality of standard flow meter input gas circuit electromagnetic valves. The intelligent gas circuit conversion device in the device comprises a multi-branch pipe which can realize the connection of a plurality of multi-gas dynamic calibrators and a plurality of standard flow meters with different measuring ranges, moreover, the output gas circuit electromagnetic valve of the multi-gas dynamic calibrators can control the switch of the output gas circuit of the different multi-gas dynamic calibrators, and the input gas circuit electromagnetic valve of the standard flow meter can control the switch of the gas circuit of the standard flow meter with different measuring ranges; further, the intelligent gas circuit conversion device is connected with the multi-gas dynamic calibrator, the mass flowmeter and the standard flowmeter respectively, the connection of the standard flowmeter and the output port of the multi-gas dynamic calibrator is realized, and the intelligent gas circuit conversion device, the standard flowmeter and the multi-gas dynamic calibrator can be intelligently controlled through data acquisition and control software, so that the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator can be completed.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a working gas circuit of a gas analyzer according to the prior art;
FIG. 2 is a schematic diagram of an intelligent gas circuit switching device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal structure of an intelligent gas circuit conversion device according to an embodiment of the present invention;
fig. 4 is a flow chart of a flow checking and calibrating method according to an embodiment of the present invention.
In the figure, A is a zero gas source, B1-B4 are multi-gas dynamic calibrators, C1-C8 are standard mass flow meters, F1-F3 are Cheng Biaozhun flow meters with different amounts, D is an intelligent gas circuit conversion device, E is a multi-branch pipe, 1-4 are multi-gas dynamic calibrators output gas circuit electromagnetic valves, 5-7 are standard flow meter input gas circuit electromagnetic valves, H is a display screen, I is a cooling fan, and J is a power supply.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 2 is a schematic diagram of a working gas path of an intelligent gas path conversion device according to an embodiment of the present invention, and fig. 3 is a schematic diagram of an internal structure of the intelligent gas path conversion device according to an embodiment of the present invention. As shown in fig. 2 and fig. 3, the flow checking and calibrating device provided by the embodiment of the invention mainly comprises a multi-gas dynamic calibrator, a mass flowmeter, an intelligent gas circuit conversion device and a plurality of standard flowmeters with different measuring ranges.
Specifically, as shown in fig. 2, the intelligent gas circuit conversion device comprises a plurality of gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of branch pipes and a plurality of standard flowmeter input gas circuit electromagnetic valves.
In practical application, because the intelligent gas circuit conversion device comprises a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of standard flowmeter input gas circuit electromagnetic valves and a plurality of branch pipelines, the input ends of the plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves can be respectively connected with the plurality of gas dynamic calibrators, and further, the plurality of standard flowmeter input gas circuit electromagnetic valves are respectively connected with a plurality of standard flowmeters with different measuring ranges. It should be noted that in the embodiment of the present invention, a mass flowmeter is further connected between the gas dynamic calibrator and the output gas circuit solenoid valve of the multi-gas dynamic calibrator, and preferably, 2 mass flowmeters are respectively connected between the output gas circuit solenoid valves of one gas dynamic calibrator and the multi-gas dynamic calibrator.
As shown in fig. 2 and fig. 3, in the flow checking and calibrating device provided by the embodiment of the invention, since the intelligent gas circuit conversion device includes 4 output gas circuit solenoid valves of multiple gas dynamic calibrators, 3 input gas circuit solenoid valves of standard flow meters, correspondingly, the number of gas dynamic calibrators connected with the output gas circuit solenoid valves of the multiple gas dynamic calibrators is also 4, and the number of mass flow meters arranged between each gas dynamic calibrator and each output gas circuit solenoid valve of the multiple gas dynamic calibrators is 2; the standard flowmeter is connected with the standard flowmeter input gas circuit electromagnetic valve and also comprises 3 standard flowmeters with different measuring ranges.
In practical application, the standard flow meters with different measuring ranges can be respectively 0-100 mL, 0-5000 mL and 0-30000 mL, and in the embodiment of the invention, the specific measuring ranges of the standard flow meters with different measuring ranges are not limited.
As shown in fig. 2, the flow checking and calibrating device provided by the embodiment of the invention further comprises a zero air source and an industrial personal computer, specifically, the output end of the zero air source is respectively connected with the input end of each multi-air dynamic calibrator, and correspondingly, the output ends of the plurality of standard flow meters are respectively connected with the input end of the industrial personal computer in a communication way.
As shown in fig. 3, the intelligent air path conversion device further comprises a cooling fan, a display screen and a power supply; specifically, each multi-gas dynamic calibrator output gas circuit electromagnetic valve and each standard flowmeter input gas circuit electromagnetic valve are respectively and electrically connected with a power supply; the cooling fan is arranged at the inner side of the intelligent gas circuit conversion device and used for cooling the inner part of the intelligent gas circuit conversion device, and is electrically connected with the power supply; further, the display screen is arranged on the outer side of the intelligent gas circuit conversion device, is respectively and electrically connected with each multi-gas dynamic calibrator output gas circuit electromagnetic valve and each standard flowmeter input gas circuit electromagnetic valve, and is used for displaying the on or off of each multi-gas dynamic calibrator output gas circuit electromagnetic valve and the on or off of each standard flowmeter input gas circuit electromagnetic valve.
The intelligent gas circuit conversion device in the flow checking and calibrating device comprises a multi-branch pipe which can realize the connection of a plurality of multi-gas dynamic calibrators and a plurality of standard flow meters with different measuring ranges, moreover, the output gas circuit electromagnetic valve of the multi-gas dynamic calibrators can control the switch of the output gas circuit of the different multi-gas dynamic calibrators, and the input gas circuit electromagnetic valve of the standard flow meters can control the switch of the gas circuit of the standard flow meters with different measuring ranges; further, the intelligent gas circuit conversion device is connected with the multi-gas dynamic calibrator, the mass flowmeter and the standard flowmeter respectively, the connection of the standard flowmeter and the output port of the multi-gas dynamic calibrator is realized, and the intelligent gas circuit conversion device, the standard flowmeter and the multi-gas dynamic calibrator can be intelligently controlled through data acquisition and control software, so that the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator can be completed. In practical application, the flow rate detection and calibration device not only effectively reduces the execution difficulty of flow rate detection and calibration work and reduces measurement errors, but also greatly saves manpower and material resources, and is particularly suitable for the daily operation maintenance process of the multi-gas dynamic calibrator. Furthermore, the equipment and accessories used by the intelligent gas circuit conversion device are easy to process and install.
In order to more clearly describe a flow rate checking and calibrating device provided by the embodiment of the present invention, the following is a flow chart of a flow rate checking and calibrating method provided in connection with fig. 4, and a specific usage method of the flow rate checking and calibrating device is further described in detail:
as shown in fig. 4, the method mainly comprises the following steps:
step 101, sequentially opening a multi-gas dynamic calibrator connected with a mass flowmeter to be checked and calibrated, wherein the multi-gas dynamic calibrator outputs a gas circuit electromagnetic valve and a standard flowmeter inputs the gas circuit electromagnetic valve;
102, selecting a standard flowmeter matched with a flow check point from a plurality of specific standard flowmeters with different measuring ranges according to the size of the flow check point, and connecting the input end of the standard flowmeter with an input gas circuit electromagnetic valve of the standard flowmeter;
step 103, when the multi-gas dynamic calibrator generates a first check point flow to be checked, sequentially reading a first flow and a second flow generated by the mass flowmeter and the standard flowmeter;
and 104, calibrating the first flow rate of the output of the multi-gas dynamic calibrator if the deviation value determined by the first flow rate and the second flow rate exceeds a set range.
It should be noted that, the basic working mode of the flow checking and calibrating device provided by the embodiment of the invention is as follows: firstly, connecting a zero gas source, adding an intelligent gas circuit conversion device on an inspection gas circuit of the multi-gas dynamic calibrator, realizing the connection of the standard flowmeter and an output gas port of the multi-gas dynamic calibrator, performing intelligent control on the intelligent gas circuit conversion device, the standard flowmeter and the multi-gas dynamic calibrator through data acquisition and control software, and if the standard flowmeter and the multi-gas dynamic calibrator exceed the allowable deviation range, sending a calibration command to complete the calibration of the mass flowmeter of the multi-gas dynamic calibrator.
As shown in fig. 2, the multiple gas dynamic calibrator provided by the embodiment of the present invention includes 4, the mass flowmeter includes 8, the multiple gas dynamic calibrator output gas circuit solenoid valve includes 4, the standard flowmeter input gas circuit solenoid valve includes 3, and the standard flowmeters with different ranges include 3. The method is only aimed at a certain multi-gas dynamic calibrator, and mass flow meters connected with the multi-gas dynamic calibrator in sequence, wherein the multi-gas dynamic calibrator outputs a gas circuit electromagnetic valve, and a standard flow meter inputs the gas circuit electromagnetic valve and a standard flow meter.
In step 101, a multi-gas dynamic prover is selected from fig. 2, a mass flow meter, and the selected mass flow meter is determined as the mass flow meter to be inspected and calibrated. And sequentially opening a multi-gas dynamic calibrator connected with the mass flowmeter, wherein the multi-gas dynamic calibrator outputs a gas circuit electromagnetic valve and a standard flowmeter inputs the gas circuit electromagnetic valve. For example, as shown in fig. 2, an instruction for performing flow inspection and calibration is sent by the industrial personal computer, so that a multi-gas dynamic calibrator output gas circuit electromagnetic valve matched with a mass flowmeter to be inspected and calibrated and a standard flowmeter input gas circuit electromagnetic valve are sequentially opened.
In practical application, because the standard flowmeter input gas circuit electromagnetic valves are respectively connected with standard flowmeters with different measuring ranges, when the standard flowmeter input gas circuit electromagnetic valve is selected, the standard flowmeter is required to be selected according to the size of a flow check point to be checked, and then the standard flowmeter input gas circuit electromagnetic valve which needs to be selected is determined according to the selected standard flowmeter.
In the prior art, the piston flowmeter is the most common standard flowmeter in the automatic monitoring of the current air quality, and the problems of difficulty in automatically acquiring the measured value of the piston flowmeter are easily caused due to the characteristic that the time required for measuring the flow of different sizes is different. In the embodiment of the invention, the measuring ranges of the standard flowmeter commonly used in the air station are respectively 0-100 mL, 0-5000 mL and 0-30000 mL, and the piston flowmeter is used for example, and the corresponding cylinder capacities are respectively 10mL, 50mL and 100mL, so that a plurality of flow check points are fixed during automatic flow checking and calibration. That is, the time for which the piston reciprocates once in the cylinder can be determined by the following formula (1):
Tr=2X/Y equation (1)
Wherein X is the cylinder capacity, Y is the size of the flow check point, and the time of the reciprocating motion of the Tr piston in the cylinder is one time.
Further, after determining the time for which the piston reciprocates once in the cylinder, the constant C time after the piston reciprocates once in the cylinder, which is the time for which the flow data is output after the piston reciprocates once in the cylinder, may also be determined to be 1 s. I.e., the time at which the flow meter flow data is generated can be determined by equation (2):
tc=tr+c formula (2)
Where C is a constant, tc is the time at which the standard flowmeter produces flow data.
It should be noted that, in the embodiment of the present invention, the time for the data acquisition software to read the flow data command is equivalent to the time for generating the flow data of the flowmeter, that is, equation (2) may be expressed as follows:
ts=tc=tr+c formula (3)
Wherein, ts is the time of reading the flow data instruction for the data acquisition software, and Tc is the time of generating flow data for the standard flowmeter.
The standard flowmeter matched with the flow check point can be rotated from the standard flowmeter with a plurality of different measuring ranges through the formula (1), and then the input end of the standard flowmeter is connected with the input gas circuit electromagnetic valve of the standard flowmeter.
In the embodiment of the invention, when the first check point flow to be checked is generated by the multi-gas dynamic calibrator, the first flow can be acquired from the mass flowmeter, and then the second flow is acquired through the standard flowmeter. Further, the deviation between the first flow rate and the second flow rate can be determined by the following formula (4):
Δl= (La-Ls)/ls×100% equation (4)
Wherein La is the first flow, ls is the second flow, and DeltaL is the deviation value.
Further, after determining the deviation between the first flow rate and the second flow rate, it is necessary to determine whether to perform the next flow rate inspection process or to calibrate the mass flowmeter to be inspected according to the relationship between the deviation value and the set value.
Specifically, when it is determined that the deviation between the first flow rate and the second flow rate exceeds the set value, as shown in fig. 2, it is necessary to perform flow calibration on the first flow rate output by the mass flowmeter of the multi-gas dynamic calibrator by outputting an instruction from the industrial personal computer, and after calibration, the next flow rate inspection flow may be performed.
The application method of the device provided by the embodiment of the invention can intelligently match the proper standard flowmeter according to the size of the flow check point, and connect the to-be-measured mass flowmeter of the multi-gas dynamic calibrator with the standard flowmeter. Because the device has multiple paths, intelligent flow inspection and calibration of a plurality of multi-gas dynamic calibrators can be completed.
The following takes fig. 2 as an example, further describes a method for performing flow inspection and calibration on mass flowmeters of a plurality of multi-gas dynamic calibrators:
taking as an example the need for flow checking and calibration of the mass flowmeter C1 of the multi-gas dynamic calibrator B1.
(1) An instruction for executing flow inspection and calibration is sent through the industrial personal computer G, so that an output gas circuit electromagnetic valve 1 matched with a mass flowmeter to be inspected and calibrated and a standard flowmeter input gas circuit electromagnetic valve are sequentially opened; the standard flow meter input gas circuit electromagnetic valve 5 is one of the standard flow meter input gas circuit electromagnetic valve 6 and the standard flow meter input gas circuit electromagnetic valve 7, and the input gas circuit is determined to be opened and closed according to the size of the flow check point.
(2) The multi-gas dynamic calibrator B1 to be tested is communicated with a standard flowmeter gas circuit to be used, wherein one of the standard flowmeter F1, the standard flowmeter F2 and the standard flowmeter F3 is selected to be a standard flowmeter with a proper measuring range according to the size of a flow check point.
(3) Transmitting an instruction for generating flow data to the multi-gas dynamic calibrator B1 to generate a first check point flow to be checked;
(4) the industrial personal computer reads the mass flow La output by the mass flowmeter C1 and the standard flow Ls output by the standard flowmeter from the multi-gas dynamic calibrator B1, and the deviation of the mass flow La and the standard flow Ls is determined by the following formula. Calculating the relative deviation of La and Ls:
ΔL＝(La-Ls)/Ls×100％。
if the delta L does not exceed the flow allowable range, entering the next flow checking flow; when L0 exceeds the allowable range, the output flow La of the B1 is subjected to flow calibration by the output instruction of the industrial personal computer, and the next flow checking flow is started after the calibration.
(5) Repeating the operation according to the step (4) until all flow check points are checked and calibrated;
(6) the industrial personal computer sends a task completion instruction to sequentially close an output gas circuit electromagnetic valve and an input gas circuit electromagnetic valve which are matched with the mass flowmeter C1 to be checked and calibrated;
if the flow rate of the mass flowmeter C2 of the multi-gas dynamic calibrator B1 is required to be checked and calibrated, repeating the steps (1) - (6); if the flow rate of the mass flow meters (C3-C8) of the other multi-gas dynamic calibrators (B2-B4) is required to be checked and calibrated, the steps (1) - (6) are only required to be repeated.
In summary, the embodiment of the invention provides a flow checking and calibrating device and a flow checking and calibrating method, wherein a multi-branch pipe included in an intelligent gas circuit conversion device in the device can realize connection between a plurality of multi-gas dynamic calibrators and a plurality of standard flow meters with different measuring ranges, furthermore, an output gas circuit electromagnetic valve of the multi-gas dynamic calibrators can control the switch of output gas circuits of the different multi-gas dynamic calibrators, and an input gas circuit electromagnetic valve of the standard flow meters can control the switch of gas circuits of the standard flow meters with different measuring ranges; further, the intelligent gas circuit conversion device is connected with the multi-gas dynamic calibrator, the mass flowmeter and the standard flowmeter respectively, the connection of the standard flowmeter and the output port of the multi-gas dynamic calibrator is realized, and the intelligent gas circuit conversion device, the standard flowmeter and the multi-gas dynamic calibrator can be intelligently controlled through data acquisition and control software, so that the inspection and calibration of the mass flowmeter of the multi-gas dynamic calibrator can be completed. Further, in practical application, the flow rate detection and calibration device not only effectively reduces the execution difficulty of flow rate detection and calibration work and reduces measurement errors, but also greatly saves manpower and material resources, and is particularly suitable for the daily operation maintenance process of the multi-gas dynamic calibrator. Furthermore, the equipment and accessories used by the intelligent gas circuit conversion device are easy to process and install.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A flow checking and calibrating method, which is applied to a flow checking and calibrating device, the device comprises: the system comprises a multi-gas dynamic calibrator, a mass flowmeter, an intelligent gas circuit conversion device and a plurality of standard flowmeters with different measuring ranges; the intelligent gas circuit conversion device comprises a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of branch pipes and a plurality of standard flowmeter input gas circuit electromagnetic valves; the output end of the multi-gas dynamic calibrator is connected with the input end of at least one mass flowmeter; the output end of the mass flowmeter is connected with the multiple branch pipes through the output gas circuit electromagnetic valve of the multiple gas dynamic calibrator; the multi-branch pipe is respectively connected with a plurality of standard flowmeters with different measuring ranges through a plurality of standard flowmeter input gas circuit electromagnetic valves; the method comprises the following steps:
sequentially opening a multi-gas dynamic calibrator connected with the mass flowmeter to be checked and calibrated, wherein the multi-gas dynamic calibrator outputs a gas circuit electromagnetic valve and a standard flowmeter inputs the gas circuit electromagnetic valve;
selecting a standard flowmeter matched with the flow check point from a plurality of specific standard flowmeters with different measuring ranges according to the size of the flow check point, and connecting the input end of the standard flowmeter with an input gas circuit electromagnetic valve of the standard flowmeter; the size of the flow check point is the proportion of the flow check point to the full-scale flow of the multi-gas dynamic calibrator;
when the multi-gas dynamic calibrator generates a first check point flow to be checked, sequentially reading a first flow and a second flow generated by the mass flowmeter and the standard flowmeter;
if the deviation value determined by the first flow rate and the second flow rate exceeds a set range, calibrating the first flow rate of the output of the multi-gas dynamic calibrator;
after the standard flowmeter matched with the flow check point is selected from the specific standard flowmeters with a plurality of different measuring ranges according to the size of the flow check point, the method further comprises the following steps:
the time for the piston to reciprocate once in the cylinder is determined by the following formula:
Tr＝2X/Y
outputting flow data through the time of one reciprocation of the piston in the cylinder and the constant C time after one reciprocation of the piston in the cylinder, and determining the time of the second flow generated by the standard flow meter through the following formula:
Tc＝Tr+C
wherein X is the cylinder capacity, Y is the size of a flow check point, the time of the reciprocating motion of the Tr piston in the cylinder is one time, C is a constant, and the time of the Tc standard flowmeter for generating the second flow is equal to the time of the Tc standard flowmeter.
2. The method as recited in claim 1, further comprising: and if the deviation value determined by the first flow rate and the second flow rate is within a set range, confirming that the mass flowmeter to be checked is within a set error.
3. The method of claim 1, wherein the bias value is determined by the following formula:
ΔL＝(La-Ls)/Ls×100％
wherein La is the first flow, ls is the second flow, and DeltaL is the deviation value.
4. A flow rate checking and calibrating device, comprising:
the system comprises a multi-gas dynamic calibrator, a mass flowmeter, an intelligent gas circuit conversion device and a plurality of standard flowmeters with different measuring ranges;
the intelligent gas circuit conversion device comprises a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves, a plurality of branch pipes and a plurality of standard flowmeter input gas circuit electromagnetic valves;
the output end of the multi-gas dynamic calibrator is connected with the input end of at least one mass flowmeter;
the output end of the mass flowmeter is connected with the multiple branch pipes through the output gas circuit electromagnetic valve of the multiple gas dynamic calibrator;
the multi-branch pipe is respectively connected with a plurality of standard flowmeters with different measuring ranges through a plurality of standard flowmeter input gas circuit electromagnetic valves;
the device also comprises an industrial personal computer, wherein the industrial personal computer is used for:
controlling to sequentially open a multi-gas dynamic calibrator connected with the mass flowmeter to be checked and calibrated, wherein the multi-gas dynamic calibrator outputs a gas circuit electromagnetic valve and a standard flowmeter inputs the gas circuit electromagnetic valve;
selecting a standard flowmeter matched with the flow check point from a plurality of specific standard flowmeters with different measuring ranges according to the size of the flow check point, and connecting the input end of the standard flowmeter with an input gas circuit electromagnetic valve of the standard flowmeter; the size of the flow check point is the proportion of the flow check point to the full-scale flow of the multi-gas dynamic calibrator;
when the multi-gas dynamic calibrator generates a first check point flow to be checked, sequentially reading a first flow and a second flow generated by the mass flowmeter and the standard flowmeter;
if the deviation value determined by the first flow rate and the second flow rate exceeds a set range, calibrating the first flow rate of the output of the multi-gas dynamic calibrator;
after the standard flowmeter matched with the flow check point is selected from the specific standard flowmeters with a plurality of different measuring ranges according to the size of the flow check point, the method further comprises the following steps:
the time for the piston to reciprocate once in the cylinder is determined by the following formula:
Tr＝2X/Y
outputting flow data through the time of one reciprocation of the piston in the cylinder and the constant C time after one reciprocation of the piston in the cylinder, and determining the time of the second flow generated by the standard flow meter through the following formula:
Tc＝Tr+C
wherein X is the cylinder capacity, Y is the size of a flow check point, the time of the reciprocating motion of the Tr piston in the cylinder is one time, C is a constant, and the time of the Tc standard flowmeter for generating the second flow is equal to the time of the Tc standard flowmeter.
5. The calibration device of claim 4, further comprising a zero gas source;
and the output end of the zero gas source is connected with the input end of the multi-gas dynamic calibrator.
6. The calibration device of claim 4, further comprising an industrial personal computer;
and the output ends of the standard flow meters are connected with the input end of the industrial personal computer.
7. The calibration device of claim 4, wherein the intelligent air circuit switching device further comprises a cooling fan, a display screen and a power supply;
the multiple multi-gas dynamic calibrator output gas circuit electromagnetic valves and the multiple standard flowmeter input gas circuit electromagnetic valves are respectively and electrically connected with the power supply;
the display screen is arranged on the outer side of the intelligent gas circuit conversion device and is respectively and electrically connected with a plurality of multi-gas dynamic calibrator output gas circuit electromagnetic valves and a plurality of standard flowmeter input gas circuit electromagnetic valves;
the cooling fan is arranged on the inner side of the intelligent air path conversion device and is electrically connected with the power supply.
8. The calibration device of claim 4, wherein the standard flow meter is a piston flow meter.
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| CN112557591A (en) * | 2020-11-16 | 2021-03-26 | 中国科学院工程热物理研究所 | Dynamic mixed gas full-component flow calibration system and calibration method |
| CN114137155B (en) * | 2021-11-03 | 2024-04-12 | 力合科技（湖南）股份有限公司 | Flow path design of multi-gas dynamic calibrator |
| CN114623904B (en) * | 2022-03-14 | 2023-07-25 | 中公高远(北京)汽车检测技术有限公司 | Device and method for calibrating gas flowmeter |
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